After this i see this var vectorLayer = new OpenLayers.Layer.Vector("Editable features"); And dont understand how to creating a layer. So i have some questions.
1 How to get URL to wfs? (i use geoserver)
2 Whats mean featureType option.
3 And more important. This code is correct? I find it here http://workshops.opengeo.org/geoext/wfs/grid.html

2 Answers
2

I think you would benefit from splitting your problem into GeoExt and OpenLayers.

Start with the OpenLayers examples (http://openlayers.org/dev/examples/), looking at each WFS example to see how it is done. Here is a really simple example http://openlayers.org/dev/examples/wfs-states.html - zoom in a bit if you don't see the white states outlines. Now look at the code for that (http://openlayers.org/dev/examples/wfs-states.js). Now work through the other WFS examples.

You should check this answer, regarding your confusions in the original question. And regarding OpenLayers.ProxyHost, you can check this link. There are several other related questions here, you can read through them to have a better understanding.